1200KM / sigma-rule
Trust Access Disable For VBApplications — Sigma Rule
Sigma rule 1a5c46e9-f32f-42f7-b2bc-6e9084db7fbf. Trust Access Disable For VBApplications — Sigma Rule. Detects registry changes to Microsoft Office "AccessVBOM" to a value of "1" which disables trust access for VBA on the victim machine and lets attackers execute malicious macros without any Microsoft Office warnings.
Rule metadata and linked tags
Author: Trent Liffick (@tliffick), Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: high. Source dates: 2020-05-22 / 2023-08-17.
{
"category": "registry_set",
"product": "windows"
}Pinned original Sigma rule · Detection Rule License 1.1
Source SHA-256: 90810ac623d402354f1f0f5a5f25d67215fbcfea58c7425dc87fe18e6da345fe
Detection logic
Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.
title: Trust Access Disable For VBApplications
id: 1a5c46e9-f32f-42f7-b2bc-6e9084db7fbf
related:
- id: 9b894e57-033f-46cf-b7fa-a52804181973
type: obsolete
status: test
description: Detects registry changes to Microsoft Office "AccessVBOM" to a value of "1" which disables trust access for VBA on the victim machine and lets attackers execute malicious macros without any Microsoft Office warnings.
references:
- https://twitter.com/inversecos/status/1494174785621819397
- https://www.mcafee.com/blogs/other-blogs/mcafee-labs/zloader-with-a-new-infection-technique/
- https://securelist.com/scarcruft-surveilling-north-korean-defectors-and-human-rights-activists/105074/
author: Trent Liffick (@tliffick), Nasreddine Bencherchali (Nextron Systems)
date: 2020-05-22
modified: 2023-08-17
tags:
- attack.persistence
- attack.defense-impairment
- attack.t1112
logsource:
category: registry_set
product: windows
detection:
selection:
TargetObject|endswith: '\Security\AccessVBOM'
Details: 'DWORD (0x00000001)'
condition: selection
falsepositives:
- Unlikely
level: high
False positives
- Unlikely
Source references
Connected ecosystem references
Exact source-tagged techniques
Telemetry review
Read the original logsource above, then inspect the linked detection workspaces for technique-level sensor context. No per-rule telemetry equivalence is inferred.
Pinned research references. No browser attack runner, live simulation result or validated detector is asserted. Source mappings and validation limits are preserved. ATT&CK / Atomic provenance · Detection provenance.